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Pioneers from Guatemala to Japan share space with wildlife and restore the way we coexist and cultivate among the trees.

Margaret Hoover leads interviews and debates.

Based on the 1935 movie musical starring Fred Astaire and Ginger Rogers, "Top Hat" features dazzling choreography and period sets, with an Irving Berlin score featuring "Cheek to Cheek," "Let's Face the Music and Dance" and "Puttin' on the Ritz.".

Sign off.

The Hunter kids head to the state park to learn why leaves change color.

After feeling left out, Luke decides to switch places with Stu; the Loops kids throw a surprise party for their parents.

Phoebe and Jay set a new record for the longest paper airplane fight; Phoebe and Jay learn how to build a stable pillow fort.

After looking at the moon through Yasmine's telescope, Tamir, Elmo and Zoe pretend to be astronauts traveling to the moon.

Devonte J. Squirrel moves to the Treeborhood; Devonte and the Wombats create a machine that makes ice cream using a bike.

Donkey wonders if she and her cousin can have fun together since they don't like doing the same things anymore; Panda thinks about how he is different from other pandas.

Things get out of control when Rosie starts a pet-sitting business; Rosie plays with a rock from Javi's rock collection.

Alma helps Mr. Ramirez figure out what to do when he lets too many cats into his shoe shop; Alma tries to convince Howard to play stickball.

The CyberSquad races through a fizzy asteroid belt and solves math patterns to get the CyberStar back from Hacker.

Japanese characters carved into a cane may unlock a family's past in a World War II relocation camp; wooden telescope; drawing of an eight-pound gold nugget.

Step into 19th-century Vienna in Otto Schenk's production of "Arabella" starring Rachel Willis-Sorensen in the title role.

Vivian struggles to find enough green beans to add to the menu; Mrs. Tessie Mae offers a golf cart tour of her garden, an introduction to pickled pork and demonstrates snapping pole beans.

All-female news analysis of issues and policy affecting the U.S.

Experts analyze prominent international affairs topics and America's role in a shifting world.

A panel of journalists provides reporting and analysis of the major stories emanating from the United States capital.

A Cartier Art Deco Tutti Frutti clutch circa 1925; a Carl Kauba cowboy bronze circa 1900; a Sumerian cuneiform tablet.

Elizabeth I's image as a warrior queen, facilitated by myths and secrets about her victory over the Spanish Armada, shaped British national identity for centuries.

Everything comes to a head as Richard and Jim descend on Bayview; the family tries to heal and reconnect; the fallout from Mary's actions continues to reverberate.

When the Titanic goes down, Lord Grantham loses his heirs, and Mary loses her fiance.

Jelly Roll performs highlights from "Whitsitt Chapel"; husband-and-wife duo The War and Treaty.